Question

You have failed two tests.You'd better start working harder, ________you won't pass the course.

A．and

B．so

C．but

D．or

Answer 1

D

考查“祈使句＋and/or＋陈述句”。因为祈使句与后面的陈述句所表达的内容是对立的关系，故用or(否则)。